finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing

HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
(current
topics)
topic 8047

Why do chromates give corrosion resistance to aluminum?


(2001)

I am a first year student, studying physical sciences at the University of Toronto. I have been asked to write a report as if I were an aircraft engineer that was defending the use of primers containing dichromate pigments to inhibit corrosion of aluminum. I need to know what hazards the metal needs to be protected from and why Cr(VI) is so good at protecting Aluminum from corrosion.

Thank You

Gord A Furious
- Toronto, Ontario, Canada


(2001)

There were several papers presented on this subject at September Cadmium, Chromium, and Nickel Alternatives Information Exchange, put on by the National Defense Center for Environmental Excellence (NDCEE). Derek DeMaree from the Army Materials Laboratory gave the best presentation I've seen on why chromate works. I suggest you contact Derek directly, but you can also contact NDCEE for a copy of his presentation.

jim treglio portrait
Jim Treglio
- Vista, California


May 18, 2010

Hi. Although Jim's answer is a good one, and appreciated, the defense industry has largely moved away from hexavalent chromates for aluminum and now considers certain trivalent chromates equivalent in corrosion protection.

Regards,

Ted Mooney, finishing.com
Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView CURRENT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.